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Definition of "dual-diaphragm":

Dual-diaphragm microphones have two separate diaphragms. This term is usually used to describe condenser (including electret) designs in which a single mic capsule has two separate vibrating diaphragms mounted parallel to one another, with either a single backplate or two backplates (mounted back-to-back). Most dual-diaphragm mics can provide multiple pickup patterns, depending on the voltage levels and phase-alignment of the two diaphragms.